You can't read/update the same file from a CICS program.
Unless your VSAM file is defined with Share Option 4,, see
your CICS systems programmer for more information.
review some of the vendor software products available that permits concurrent updating. There is a new product from HostBridge Technology that provides ability to code COBOL batch programs to
communicate with any CICS resource (files, tdq's , tsq's, programs, transactions, etc.)